One of my good friends is now a BM
To complicate things she's also my brother's ex/nephews mom.
Shes in the wanting to have her cake and eat it too stage. She's dating someone else, but still wants to be fully a part of our family and is constantly inviting my brother to do things with her.
My brother was briefly dating someone else. That GF saw my brother and his ex at the park together with my nephew and his ex didn't understand why the new girlfriend was upset and thinks it's just part of coparenting. This is basically what BM in my situation was doing (although DH always declined) and now I can see that my brothers ex probably doesn't want to let him move on even though she did. And I think thats what BM was doing too.
Her boyfriend is perfectly fine with the situation- most likely because he's on the autism spectrum and probably somewhat oblivious.
I feel like it's going to be a difficult situation to watch and keep quiet about.